Exhaust silencer for internal combustion engines



March 24, 1959 c. ABARTH 2,878,838

EXHAUST SILENCER FOR INTERNAL COMBUSTION ENGINES Filed Jan. 15, 1958 United States Patent EXHAUST SILENCER FOR INTERNAL COMBUSTION ENGINES Carlo Abarth, Turin, Italy, assignor to Abarth & C. Soc. :1 r.l., Turin, Italy Application January 15, 1958, Serial No. 709,078 Claims priority, application Italy February 7, 1957 8 Claims. (Cl. 181--50) This invention relates to an exhaust silencer for internal combustion engines, more particularly such on motor cars of the Volkswagen model, wherein the silencer com prises an elongated cylindrical casing closed at its ends by welded head portions, a foraminated tube coaxially arranged within the case, said tube being smaller in length than the case in order to leave two chambers at the case ends, glass wool arranged in the clearance between the foraminated tube and case, a pair of tubes having each an arcuate end portion for the inlet of the exhaust gas from the engine in the end chambers, and two pairs of tubes for the outlet of the gases from the foraminated tube to the outside.

The invention shall be described with reference to the accompanying drawings, wherein:

Figure 1 is a part sectional plan view of the improved exhaust silencer,

Figure 2 is a sectional view of Figure 1 on line lL-H,

Figure 3 is an end view of a silencer, and

Figure 4 is a sectional view of Figure 1 on line IV-IV.

The exhaust silencer comprises an elongated cylindrical case 1 closed at its ends by welded head pieces 2. A pipe 3 is arranged within the casing and has holes 4 bored through its walls, the pipe 3 being smaller in length than the case in order to leave at the ends thereof two chambers 5, 6.

The tube 3 is held in position in the case 1 by annular flat members 7, 8 welded along their outer periphery to the case 1 and along their inner periphery to the tube 3, the glass wool 9 being arranged in the resulting clearance, between the case 1 and tube 3.

Tubes 10 and 11 open into the end chambers 5, 6 in the case 1 for the inlet of the exhaust gas from the engine, said tubes 10 and 11 being fitted at one end with fittings 10a, 11a, respectively for connection with the exhaust manifolds of the engine and having their other end arcuate as indicated at 1% for the tube 10. The gas inlets 10, 11 extend through the top portion of the case wall as clearly indicated in respect of tube 10 in Figure 4, and are provided with an extension within the case, such as 100 for throwing the gas flow against the case wall portion situated ahead in the direction of drive of the vehicle.

Outlet of the gases from the case is effected by means of two tube pairs 12, 13, respectively, extending through elongated bored collars 14, 15, respectively, provided with contact edges bent over and welded in suitable elongated openings cut in the case'wall.

Sleeves 16, 17 welded along one edge to the abovementioned openings in the case wall and along their other edge on cooperating openings cut within the foraminated tube 3 prevent contact of the glass wool with the exhaust pipes 12, 13.

The case 1 is supported by a pair of tubular supports 19, 20, one end of which extends through a case wall and is welded thereto, the other end being secured to suitable bearings fitted to the vehicle engine.

The case of the improved exhaust silencer is conveniently of a length A which is approximately 670 mm. and a diameter B which is approximately 110 mm.

The foraminated tube is of a diameter F of 60 mm.

The gas inlet tubes are of a diameter E about 32 mm.,

5 the outlet tubes being of a diameter D about 29 mm.

What I claim is:

1. Exhaust silencer for internal combustion engines, wherein the silencer comprises an elongated cylindrical case closed at both ends by welded head portions, a foraminated tube coaxially arranged within the casing, said tube being smaller in length than the ease thereby leaving free in the case two chambers at each end thereof, glass wool arranged in the clearance between the foraminated tube and case, a pair of inlet tubes having each an arcuate end portion protruding into the respective chamber and two pairs of outlet tubes connecting the inside of the foraminated tube to the outside.

2. Exhaust silencer as claimed in claim 1, wherein the gas inlet tubes to the end chambers in the case ex tend through a top portion of the case wall and wherein the arcuate portions are arranged for throwing the gas flow against the case wall portion facing the direction of drive of the vehicle.

3. Exhaust silencer as claimed in claim 1, wherein the foraminated inner tube is secured to the case by means of a pair of flat supporting rings welded along their outer periphery to the inner case wall and along the periphery of their bore to the outer surface of the foraminated tube.

4. Exhaust silencer as claimed in claim 1, wherein the outlet tubes of each pair are welded in holes bored in an elongated supporting collar secured at its edges in an opening in the case wall.

5. Exhaust silencer as claimed in claim 1, wherein the foraminated tube is formed at the outlet tubes with an opening, the glass wool filled in the clearance between the foraminated tube and inner case surface being retained in said clearance by a sleeve welded on at one end along the edges of the opening in the foraminated tube and along its other edge to the edges of the opening in the case.

6. Exhaust silencer as claimed in claim 1, wherein the case is of a length about 670 mm. and a diameter about mm.

7. Exhaust silencer as claimed in claim 1, wherein the inner foraminated tube is of a diameter about 60 mm.

8. Exhaust silencer as claimed in claim 1, wherein the gas inlet tubes are of a diameter about 32 mm. and the outlet tubes are of a diameter about 29 mm.

No references cited. 

